Swivel pin mounting for planer aprons



Jam 1952 J. M. WALTER SWIVEL PIN MOUNTING FDR PLANER APRONS Filed Dec. 17, 1946 ATTORNEYS- INVENTOR. JO N M l Kunev Patented Jan. 22, 1952 A v V l rllfiliMtilgggl :FOR PLANElt. V H

John M. Walter, Cincinnati, Ohio assignorto; The G. A. Gray Company-,1fiincinnati flhio a.

corporation of Ohio Application December 17, 1946; SerialNo. 716,731

My invention-relates as new development in connection with the swivel pin mounting, of planer; aprons. The conventional planer carries the; apron, on which the cutting "tools are to be mountedon apivotal mounting in whatis known as the tool box the latter being;carried on the planer head, and the headdmturn mounted on the.plan rcro s ail-v The firmnessofihd aprona ainst vibration or play is an important feature in accurate work in metalinplaners. In general-practice the toolbox is. provided with .two .proJ' eting side walls which define between them, a space into which the apron hangs, which is known as a jaw or pocket. The apron can be and is swung outwardly from this jaw so as to clear the tools from the work on a return stroke. On the work stroke the apron rests firmly against the face of the tool box lying between the two side walls of the box. To pivot the apron, bosses are provided at the upper ends of the side walls, and a slightly tapered hole is formed in the tool box and the bosses. The pin is held in the bosses and passes through the hole in the top of the apron.

When this pin becomes worn it can be adjusted somewhat because of its tapered construction, but this has not, over the years, proven to be fully satisfactory. When the pin wears out, and replacement is necessary, it is often the case that the entire structure must be bored out again in fitting the new pin. Finally the movement of the apron on a tapered pin is not one which assures the best fit of the apron between the side walls of the tool box jaw.

According to my invention a perfectly cylindrical pin is used, and means provided which can be replaced for assuring a perfect fit of the pin, not only in the tool box but in the apron as well. One of my objects is to provide a pin which has a uniform dimension at all bearing surfaces, thus avoiding making holes of different diameters in the bosses of the tool box and the top of the apron. It would be possible but very diflicult to make holes of difierent diameter but yet perfectly centered on each other. This difficulty would be an obstacle to remachining the ac aims. (or anz -52),.

parts to take a new pin. By using a series of holes of precisely the same diameter, I am able to form the holes byretaining the apron and tool box in a fixture and boring the holes at one time through both members. They are thus perfectly aligned. I then use bushings as bearing elements between the pin and the bosses and apron, with the advantage of being able to replace the bushings in case of wear, thus insuring 2? perfectly aligned holes through the partslatv all times: l V

I have shown one-example of my invention in theappended drawings, and wish it unde'rstood thatthis is=an example only, and that modifications-without departing from the principles of thestr-ucture as setfor-th in the appendediclaims; arewithinthe scope of' my invention.

ln the drawingsz apron;

Figure 2 is-a side viewthereof;

- Figure 3 is a section' on the line 3+4 5 of 'Fi'gure 2.

I have illustrated a tool box having a main body I, with side walls 2, 2, forming the pocket or jaw in which the apron 3 is held during cutting movement. On the face of the apron I have shown a tool 4 held by clamps 5.

In building my construction the apron. and tool box are assembled together in proper position and held firmly. Thereupon a cylindrical hole is bored straight through the upper ends of the side walls (forming bosses) and through the top of the apron. I have indicated this hole at 2a, 2a in the side walls of the tool box and at 3a in the apron.

Bushings B are provided, which in this case are alike, and they are pressed lightly into the holes 2a, 2a, and into the ends of the holes 3a. Over the open ends of the bosses I mount thrust plates I. The pin 8 is thrust through the assembly, and is machined to have a floating fit in the bushings.

For lubrication purposes it is desired to machine away a zone of the pin as at 8% between the ends of the two bushings in the ends of the apron hole, thus leaving a space between the pin and the hole, which is intercepted by an oil hole 9 in the top of the apron.

Now it would be possible to press the pin into the holes 2a, 2a and have bushing only in the apron. It would also be possible to press the pin into the hole in the apron and have bushing only in the tool box, but either of these constructions would require either two working diameters on the pin or two working diameters of holes. and as has already been remarked, it is difllcult to align perfectly, holes of different diameters, which also applies to surfaces of diilerent diam eters. By my invention the hole is bored at once through the apron and tool box, and the pin is cylindrical and has but one single working diameter, although certain advantages of my inven- Figure 1 is a front elevation of a tool boxv and Certain of the advantages of my construction 1 may be obtained by boring the hole as. already described, and omitting the bushings, permitting- 4 of the hole in the apron, said bushings being of like diameter, said pin being fioatingly held in said bushings, and end restraining means for holding the pin in place, said means comprising end plates Y located to close the holes in the tool box.

3. In combination with a tool box and apron, pin bosses in the toolbox, saidqapron 'and pin bosses having holes bored therethroughi'n alignment, a pin passing through the holes, and bushings located within the holes and constituting thebearing. .on the pin, said bushings being re- 1 placeable, the said pin being floatingly mounted the pin, which is straight cylindrical, as before to float in the assembly. When this is followed, the replacement by bushings isnotavailable in connection with repair of a worn construction, and a new pin and newly bored out holeswould-be required.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: 1

1. In combination with a tool box and apron, a straight cylindrical pin of uniform diameter for pivotally mounting the apron on thetool box, said apron and tool box having mounting holes for said pin bored therethrough in alignment and of uniform cylindricaldiameter throughout, and bushings for said pin in the holes in said tool box,

and within the ends, at least, of the hole in the bushings are lightly pressed into the holes in the tool box, and lightly pressed into the ends at least in the bushings, and means for restraining endwise movement of the pin in the bushings.

JOHN M. WALTER.

REFERENCES CITED I llhefollowing references are of record in the file of this patent:

UNITED STA I'ES PATENTS,

Number Name Date 762,284 Costley -June 14,190; 837,060 7 Harley Nov.-27,- 1906 1,216,454 Ingle et al. Feb. 20, 1917 1,879,839 Brown et al. Sept. 17, 1932 1,896,360 Hazelton, Febe7, 1933 2,385,519 Jarrell Sept. 25, 1945 j FOREIGN PATENTS Number Country I Date T 379,791 Germany ..1'. Nov. 11, 1921 

